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MANAGING THE TWOSPOTTED SPIDER MITE IN STRAWBERRY, 1999

MANAGING THE TWOSPOTTED SPIDER MITE IN STRAWBERRY, 1999 (C17) STRAWBERRY: Fragaria x ananassa Duchesne, 'Sweet Charlie' James F. Price University of Florida-IFAS Gulf Coast Research and Education Center 5007 60th Street East Bradenton, FL 34203 Tel: (941) 751-7636 ext. 246 Fax: (941) 751-7639 Jprice@mail.ifas.ufl.edu Elzie McCord Jr New College of Florida 5700 Tamiami Trail Sarasota, FL 34243-2197 Tel: (941) 359-4646 Fax: (941) 359-4396 Emccord@ncf.edu Twospotted spider mite: Tetranychus urticae (Koch) TD2383-01 (cyhexatin) was compared to Agri-Mek (abamectin), TD2383-01 followed by Agri-Mek, and TD2383-01 followed by Brigade (bifenthrin) on an Agri-Mek schedule for control of the twospotted spider mite (TSSM) on 'Sweet Charlie' strawberry at Gulf Coast Research and Education Center, Dover, FL. The Agri-Mek standard schedule was one weekly application for 2 wk, wait 21 days and one weekly application for 2 wk resulting in a total of four applications. When TD2383-01 was used in combination with another control agent TD2383-01 was applied during the first week and the accompanying control agent was applied during the second week. This pattern of application was repeated after the 21-day treatment-free period. Other treatments were MYCO 0101 (cinnamaldehyde), applied at two concentrations, and Naturalis-T (Beauveria bassiana), all of which were applied weekly for 6 wk. The treatment dates were 3, 10, 17, and 24 Feb and 3 and 10 Mar, 1999. The experiment was conducted in four replications in a RCB design on plastic mulch beds with 4 ft bed spacing. Each plot consisted of 20 plants in two 10-plant rows per bed. Treatments were applied using a hand-held sprayer with a spray wand outfitted with a nozzle containing a 45° core and a number 4 disc that was pressurized by compressed CO operating to 60 psi and calibrated to deliver 100 gpa. Ten randomly selected leaflets/plot were collected from the middle one-third stratum of the plants, prior to weekly applications. Mites were brushed onto rotating sticky disks. Mite motile forms were counted on 1/10th of the disk surface to estimate an average number of mites/leaflet. Data were transformed √ (x + 0.5) prior to ANOVA and means were separated by LSD (P = 0.05). Data were retransformed to the original scale for reporting. TD2383-01, TD2383-01 followed by Agri-Mek, and TD2383-01 followed by Brigade provided excellent control of TSSM but control was not significantly different from that of Agri-Mek alone. All of the above treatments provided significantly greater control than did MYCO 0101 and the untreated check. Naturalis-T provided an intermediate level of control (Table 1.). No visible effects of phytotoxicity were found. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

MANAGING THE TWOSPOTTED SPIDER MITE IN STRAWBERRY, 1999

Price, James F.; McCord, Elzie
Arthropod Management Tests , Volume 28 (1) – Jan 1, 2003
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Oxford University Press
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© Published by Oxford University Press.
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2155-9856
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10.1093/amt/28.1.C17
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Abstract

(C17) STRAWBERRY: Fragaria x ananassa Duchesne, 'Sweet Charlie' James F. Price University of Florida-IFAS Gulf Coast Research and Education Center 5007 60th Street East Bradenton, FL 34203 Tel: (941) 751-7636 ext. 246 Fax: (941) 751-7639 Jprice@mail.ifas.ufl.edu Elzie McCord Jr New College of Florida 5700 Tamiami Trail Sarasota, FL 34243-2197 Tel: (941) 359-4646 Fax: (941) 359-4396 Emccord@ncf.edu Twospotted spider mite: Tetranychus urticae (Koch) TD2383-01 (cyhexatin) was compared to Agri-Mek (abamectin), TD2383-01 followed by Agri-Mek, and TD2383-01 followed by Brigade (bifenthrin) on an Agri-Mek schedule for control of the twospotted spider mite (TSSM) on 'Sweet Charlie' strawberry at Gulf Coast Research and Education Center, Dover, FL. The Agri-Mek standard schedule was one weekly application for 2 wk, wait 21 days and one weekly application for 2 wk resulting in a total of four applications. When TD2383-01 was used in combination with another control agent TD2383-01 was applied during the first week and the accompanying control agent was applied during the second week. This pattern of application was repeated after the 21-day treatment-free period. Other treatments were MYCO 0101 (cinnamaldehyde), applied at two concentrations, and Naturalis-T (Beauveria bassiana), all of which were applied weekly for 6 wk. The treatment dates were 3, 10, 17, and 24 Feb and 3 and 10 Mar, 1999. The experiment was conducted in four replications in a RCB design on plastic mulch beds with 4 ft bed spacing. Each plot consisted of 20 plants in two 10-plant rows per bed. Treatments were applied using a hand-held sprayer with a spray wand outfitted with a nozzle containing a 45° core and a number 4 disc that was pressurized by compressed CO operating to 60 psi and calibrated to deliver 100 gpa. Ten randomly selected leaflets/plot were collected from the middle one-third stratum of the plants, prior to weekly applications. Mites were brushed onto rotating sticky disks. Mite motile forms were counted on 1/10th of the disk surface to estimate an average number of mites/leaflet. Data were transformed √ (x + 0.5) prior to ANOVA and means were separated by LSD (P = 0.05). Data were retransformed to the original scale for reporting. TD2383-01, TD2383-01 followed by Agri-Mek, and TD2383-01 followed by Brigade provided excellent control of TSSM but control was not significantly different from that of Agri-Mek alone. All of the above treatments provided significantly greater control than did MYCO 0101 and the untreated check. Naturalis-T provided an intermediate level of control (Table 1.). No visible effects of phytotoxicity were found.

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Arthropod Management Tests – Oxford University Press

Published: Jan 1, 2003

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